]> git.sesse.net Git - ffmpeg/blobdiff - configure
configure: fix print_config() with broke awks
[ffmpeg] / configure
index 3e299092e6202a48e521b376fd21f072373b5867..9528b5d890c167281be9f53f2527a8ae51f5bee0 100755 (executable)
--- a/configure
+++ b/configure
@@ -120,6 +120,7 @@ Component options:
   --disable-dct            disable DCT code
   --disable-dwt            disable DWT code
   --disable-lsp            disable LSP code
+  --disable-lzo            disable LZO decoder code
   --disable-mdct           disable MDCT code
   --disable-rdft           disable RDFT code
   --disable-fft            disable FFT code
@@ -565,31 +566,29 @@ check_deps(){
     done
 }
 
-print_config_h(){
-    enabled $1 && v=1 || v=0
-    echo "#define $2 $v"
-}
-
-print_config_mak(){
-    enabled $1 && v= || v=!
-    echo "$v$2=yes"
-}
-
-print_config_asm(){
-    enabled $1 && v=1 || v=0
-    echo "%define $2 $v"
-}
-
 print_config(){
     pfx=$1
     files=$2
     shift 2
-    for cfg; do
-        ucname="$(toupper $cfg)"
-        for f in $files; do
-            "print_config_${f##*.}" $cfg ${pfx}${ucname} >>$f
-        done
-    done
+    map 'eval echo "$v \${$v:-no}"' "$@" |
+    awk "BEGIN { split(\"$files\", files) }
+        {
+            c = \"$pfx\" toupper(\$1);
+            v = \$2;
+            sub(/yes/, 1, v);
+            sub(/no/,  0, v);
+            for (f in files) {
+                file = files[f];
+                if (file ~ /\\.h\$/) {
+                    printf(\"#define %s %d\\n\", c, v) >>file;
+                } else if (file ~ /\\.asm\$/) {
+                    printf(\"%%define %s %d\\n\", c, v) >>file;
+                } else if (file ~ /\\.mak\$/) {
+                    n = -v ? \"\" : \"!\";
+                    printf(\"%s%s=yes\\n\", n, c) >>file;
+                }
+            }
+        }"
 }
 
 print_enabled(){
@@ -641,6 +640,12 @@ add_host_ldflags(){
     append host_ldflags $($host_ldflags_filter "$@")
 }
 
+add_compat(){
+    append compat_objs $1
+    shift
+    map 'add_cppflags -D$v' "$@"
+}
+
 check_cmd(){
     log "$@"
     "$@" >> $logfile 2>&1
@@ -704,11 +709,8 @@ ld_o(){
 
 check_ld(){
     log check_ld "$@"
-    flags=''
-    libs=''
-    for f; do
-        test "${f}" = "${f#-l}" && flags="$flags $f" || libs="$libs $f"
-    done
+    flags=$(filter_out '-l*' "$@")
+    libs=$(filter '-l*' "$@")
     check_cc $($cflags_filter $flags) || return
     flags=$($ldflags_filter $flags)
     libs=$($ldflags_filter $libs)
@@ -781,11 +783,13 @@ EOF
 check_mathfunc(){
     log check_mathfunc "$@"
     func=$1
-    shift
+    narg=$2
+    shift 2
+    test $narg = 2 && args="f, g" || args="f"
     disable $func
     check_ld "$@" <<EOF && enable $func
 #include <math.h>
-float foo(float f) { return $func(f); }
+float foo(float f, float g) { return $func($args); }
 int main(void){ return 0; }
 EOF
 }
@@ -953,7 +957,7 @@ apply(){
 cp_if_changed(){
     cmp -s "$1" "$2" && echo "$2 is unchanged" && return
     mkdir -p "$(dirname $2)"
-    cp -f "$1" "$2"
+    $cp_f "$1" "$2"
 }
 
 # CONFIG_LIST contains configurable options, while HAVE_LIST is for
@@ -1026,6 +1030,7 @@ CONFIG_LIST="
     libxavs
     libxvid
     lsp
+    lzo
     mdct
     memalign_hack
     network
@@ -1074,6 +1079,8 @@ ARCH_LIST='
     sh4
     sparc
     sparc64
+    tilegx
+    tilepro
     tomi
     x86
     x86_32
@@ -1119,6 +1126,33 @@ HAVE_LIST_PUB='
     fast_unaligned
 '
 
+MATH_FUNCS="
+    atanf
+    atan2f
+    cbrtf
+    cosf
+    exp2
+    exp2f
+    expf
+    isinf
+    isnan
+    ldexpf
+    llrint
+    llrintf
+    log2
+    log2f
+    log10f
+    lrint
+    lrintf
+    powf
+    rint
+    round
+    roundf
+    sinf
+    trunc
+    truncf
+"
+
 HAVE_LIST="
     $ARCH_EXT_LIST
     $(add_suffix _external $ARCH_EXT_LIST)
@@ -1126,6 +1160,7 @@ HAVE_LIST="
     $HAVE_LIST_CMDLINE
     $HAVE_LIST_PUB
     $THREADS_LIST
+    $MATH_FUNCS
     aligned_malloc
     aligned_stack
     alsa_asoundlib_h
@@ -1135,7 +1170,6 @@ HAVE_LIST="
     asm_mod_y
     attribute_may_alias
     attribute_packed
-    cbrtf
     closesocket
     cmov
     cpunop
@@ -1153,8 +1187,6 @@ HAVE_LIST="
     dxva_h
     ebp_available
     ebx_available
-    exp2
-    exp2f
     fast_64bit
     fast_clz
     fast_cmov
@@ -1168,28 +1200,21 @@ HAVE_LIST="
     GetProcessTimes
     GetSystemTimeAsFileTime
     getrusage
+    getservbyport
     gettimeofday
     gnu_as
     ibm_asm
     inet_aton
     io_h
     isatty
-    isinf
-    isnan
     jack_port_get_latency_range
     ldbrx
     libdc1394_1
     libdc1394_2
-    llrint
-    llrintf
     local_aligned_16
     local_aligned_8
     localtime_r
-    log2
-    log2f
     loongson
-    lrint
-    lrintf
     machine_ioctl_bt848_h
     machine_ioctl_meteor_h
     malloc_h
@@ -1198,14 +1223,12 @@ HAVE_LIST="
     mkstemp
     mm_empty
     mmap
+    mprotect
     msvcrt
     nanosleep
     poll_h
     posix_memalign
     rdtsc
-    rint
-    round
-    roundf
     sched_getaffinity
     sdl
     sdl_video_size
@@ -1240,8 +1263,6 @@ HAVE_LIST="
     sys_time_h
     sys_videoio_h
     threads
-    trunc
-    truncf
     unistd_h
     usleep
     vfp_args
@@ -1417,7 +1438,9 @@ atrac3_decoder_select="mdct"
 binkaudio_dct_decoder_select="mdct rdft dct sinewin"
 binkaudio_rdft_decoder_select="mdct rdft sinewin"
 cavs_decoder_select="golomb mpegvideo"
+comfortnoise_encoder_select="lpc"
 cook_decoder_select="mdct sinewin"
+cscd_decoder_select="lzo"
 cscd_decoder_suggest="zlib"
 dca_decoder_select="mdct"
 dnxhd_encoder_select="aandcttables mpegvideoenc"
@@ -1497,6 +1520,7 @@ msmpeg4v3_encoder_select="h263_encoder"
 mss2_decoder_select="vc1_decoder"
 nellymoser_decoder_select="mdct sinewin"
 nellymoser_encoder_select="mdct sinewin"
+nuv_decoder_select="lzo"
 png_decoder_select="zlib"
 png_encoder_select="zlib"
 qcelp_decoder_select="lsp"
@@ -1609,7 +1633,7 @@ eac3_demuxer_select="ac3_parser"
 flac_demuxer_select="flac_parser"
 ipod_muxer_select="mov_muxer"
 matroska_audio_muxer_select="matroska_muxer"
-matroska_demuxer_suggest="zlib bzlib"
+matroska_demuxer_suggest="bzlib lzo zlib"
 mov_demuxer_suggest="zlib"
 mp3_demuxer_select="mpegaudio_parser"
 mp4_muxer_select="mov_muxer"
@@ -1717,49 +1741,6 @@ avserver_extralibs='$ldl'
 
 doc_deps="texi2html"
 
-# tests
-
-mpg_test_deps="mpeg1system_muxer mpegps_demuxer"
-seek_lavf_mxf_d10_test_deps="mxf_d10_test"
-
-test_deps(){
-    suf1=$1
-    suf2=$2
-    shift 2
-    for v; do
-        dep=${v%=*}
-        tests=${v#*=}
-        for name in ${tests}; do
-            append ${name}_test_deps ${dep}$suf1 ${dep}$suf2
-        done
-    done
-}
-
-test_deps _muxer _demuxer                                               \
-    aiff                                                                \
-    pcm_alaw=alaw                                                       \
-    asf                                                                 \
-    au                                                                  \
-    avi                                                                 \
-    dv=dv_fmt                                                           \
-    ffm                                                                 \
-    flv=flv_fmt                                                         \
-    gxf                                                                 \
-    matroska=mkv                                                        \
-    mmf                                                                 \
-    mov                                                                 \
-    pcm_mulaw=mulaw                                                     \
-    mxf="mxf mxf_d10"                                                   \
-    nut                                                                 \
-    ogg                                                                 \
-    rawvideo=pixfmt                                                     \
-    rm                                                                  \
-    swf                                                                 \
-    mpegts=ts                                                           \
-    voc                                                                 \
-    wav                                                                 \
-    yuv4mpegpipe=yuv4mpeg                                               \
-
 # default parameters
 
 logfile="config.log"
@@ -1777,6 +1758,7 @@ shlibdir_default="$libdir_default"
 ar_default="ar"
 cc_default="gcc"
 host_cc_default="gcc"
+cp_f="cp -f"
 ln_s="ln -sf"
 nm_default="nm -g"
 objformat="elf"
@@ -1909,23 +1891,15 @@ ALL_COMPONENTS="
     $PROTOCOL_LIST
 "
 
-find_tests(){
-    map "echo ${2}\${v}_test" $(ls "$source_path"/tests/ref/$1 | grep -v '[^-a-z0-9_]')
-}
-
-LAVF_TESTS=$(find_tests lavf)
-LAVFI_TESTS=$(find_tests lavfi)
-SEEK_TESTS=$(find_tests seek seek_)
-
-ALL_TESTS="$LAVF_TESTS $LAVFI_TESTS $SEEK_TESTS"
-
 for n in $COMPONENT_LIST; do
     v=$(toupper ${n%s})_LIST
     eval enable \$$v
     eval ${n}_if_any="\$$v"
 done
 
-enable $ARCH_EXT_LIST $ALL_TESTS
+disable snow_decoder snow_encoder
+
+enable $ARCH_EXT_LIST
 
 die_unknown(){
     echo "Unknown option \"$1\"."
@@ -2036,8 +2010,6 @@ if enabled cross_compile; then
         die "Must specify target arch and OS when cross-compiling"
 fi
 
-set_default arch target_os
-
 ar_default="${cross_prefix}${ar_default}"
 cc_default="${cross_prefix}${cc_default}"
 nm_default="${cross_prefix}${nm_default}"
@@ -2047,18 +2019,29 @@ ranlib="${cross_prefix}${ranlib}"
 sysinclude_default="${sysroot}/usr/include"
 
 case "$toolchain" in
+    clang-asan)
+        cc_default="clang"
+        add_cflags  -faddress-sanitizer
+        add_ldflags -faddress-sanitizer
+    ;;
+    clang-tsan)
+        cc_default="clang"
+        add_cflags  -fthread-sanitizer
+        add_ldflags -fthread-sanitizer
+    ;;
     msvc)
         cc_default="c99wrap cl"
         ld_default="c99wrap link"
         nm_default="dumpbin -symbols"
         ar_default="lib"
+        target_os_default="win32"
     ;;
     ?*)
         die "Unknown toolchain $toolchain"
     ;;
 esac
 
-set_default cc pkg_config sysinclude
+set_default arch cc pkg_config sysinclude target_os
 enabled cross_compile || host_cc_default=$cc
 set_default host_cc
 
@@ -2069,7 +2052,7 @@ fi
 
 exesuf() {
     case $1 in
-        mingw32*|cygwin*|*-dos|freedos|opendos|os/2*|symbian) echo .exe ;;
+        mingw32*|win32|win64|cygwin*|*-dos|freedos|opendos|os/2*|symbian) echo .exe ;;
     esac
 }
 
@@ -2133,7 +2116,7 @@ msvc_flags(){
             -Wall)                echo -W4 -wd4244 -wd4127 -wd4018 -wd4389 \
                                        -wd4146 -wd4057 -wd4204 -wd4706 -wd4305 \
                                        -wd4152 -wd4324 -we4013 -wd4100 -wd4214 \
-                                       -wd4996 ;;
+                                       -wd4996 -wd4273 ;;
             -std=c99)             ;;
             -fno-math-errno)      ;;
             -fno-common)          ;;
@@ -2475,36 +2458,26 @@ case "$arch" in
     arm*)
         arch="arm"
     ;;
-    mips|mipsel|IP*)
+    mips*|IP*)
         arch="mips"
     ;;
-    mips64*)
-        arch="mips"
-        subarch="mips64"
-    ;;
-    parisc|hppa)
-        arch="parisc"
-    ;;
-    parisc64|hppa64)
+    parisc*|hppa*)
         arch="parisc"
-        subarch="parisc64"
     ;;
-    "Power Macintosh"|ppc|powerpc)
+    "Power Macintosh"|ppc*|powerpc*)
         arch="ppc"
     ;;
-    ppc64|powerpc64)
-        arch="ppc"
-        subarch="ppc64"
-    ;;
     s390|s390x)
         arch="s390"
     ;;
     sh4|sh)
         arch="sh4"
     ;;
-    sun4u|sparc64)
+    sun4u|sparc*)
         arch="sparc"
-        subarch="sparc64"
+    ;;
+    tilegx|tile-gx)
+        arch="tilegx"
     ;;
     i[3-6]86|i86pc|BePC|x86pc|x86_64|amd64)
         arch="x86"
@@ -2595,12 +2568,12 @@ elif enabled x86; then
 elif enabled sparc; then
 
     case $cpu in
-        niagara)
+        cypress|f93[04]|tsc701|sparcl*|supersparc|hypersparc|niagara|v[789])
             cpuflags="-mcpu=$cpu"
             disable vis
         ;;
-        sparc64)
-            cpuflags="-mcpu=v9"
+        ultrasparc*|niagara[234])
+            cpuflags="-mcpu=$cpu"
         ;;
     esac
 
@@ -2687,13 +2660,35 @@ EOF
 check_host_cflags -std=c99
 check_host_cflags -Wall
 
+check_64bit(){
+    arch32=$1
+    arch64=$2
+    expr=$3
+    check_code cc "" "int test[2*($expr) - 1]" &&
+        subarch=$arch64 || subarch=$arch32
+}
+
 case "$arch" in
-    alpha|ia64|mips|parisc|sparc)
+    alpha|ia64)
+        spic=$shared
+    ;;
+    mips)
+        check_64bit mips mips64 '_MIPS_SIM > 1'
+        spic=$shared
+    ;;
+    parisc)
+        check_64bit parisc parisc64 'sizeof(void *) > 4'
+        spic=$shared
+    ;;
+    ppc)
+        check_64bit ppc ppc64 'sizeof(void *) > 4'
+    ;;
+    sparc)
+        check_64bit sparc sparc64 'sizeof(void *) > 4'
         spic=$shared
     ;;
     x86)
-        subarch="x86_32"
-        check_code cc "" "int test[(int)sizeof(char*) - 7]" && subarch="x86_64"
+        check_64bit x86_32 x86_64 'sizeof(void *) > 4'
         if test "$subarch" = "x86_64"; then
             spic=$shared
         fi
@@ -2795,6 +2790,30 @@ case $target_os in
         enable dos_paths
         add_cppflags -U__STRICT_ANSI__
         ;;
+    win32|win64)
+        if enabled shared; then
+            # Link to the import library instead of the normal static library
+            # for shared libs.
+            LD_LIB='%.lib'
+            # Cannot build shared and static libraries at the same time with
+            # MSVC.
+            disable static
+        fi
+        shlibdir_default="$bindir_default"
+        SLIBPREF=""
+        SLIBSUF=".dll"
+        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
+        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
+        SLIB_CREATE_DEF_CMD='makedef $(SUBDIR)lib$(NAME).ver $(OBJS) > $$(@:$(SLIBSUF)=.def)'
+        SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
+        SLIB_INSTALL_LINKS=
+        SLIB_INSTALL_EXTRA_SHLIB='$(SLIBNAME:$(SLIBSUF)=.lib)'
+        SLIB_INSTALL_EXTRA_LIB='$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.def)'
+        SHFLAGS='-dll -def:$$(@:$(SLIBSUF)=.def) -implib:$(SUBDIR)$(SLIBNAME:$(SLIBSUF)=.lib)'
+        objformat="win32"
+        ranlib=:
+        enable dos_paths
+        ;;
     cygwin*)
         target_os=cygwin
         shlibdir_default="$bindir_default"
@@ -2875,6 +2894,19 @@ case $target_os in
         ;;
     minix)
         ;;
+    plan9)
+        add_cppflags -D_C99_SNPRINTF_EXTENSION  \
+                     -D_REENTRANT_SOURCE        \
+                     -D_RESEARCH_SOURCE         \
+                     -DFD_SETSIZE=96            \
+                     -DHAVE_SOCK_OPTS
+        add_compat strtod.o strtod=avpriv_strtod
+        network_extralibs='-lbsd'
+        exeobjs=compat/plan9/main.o
+        disable avserver
+        ln_s='ln -s -f'
+        cp_f='cp'
+        ;;
     none)
         ;;
     *)
@@ -2898,10 +2930,10 @@ elif check_cpp_condition newlib.h "defined _NEWLIB_VERSION"; then
     libc_type=newlib
 elif check_func_headers stdlib.h _get_doserrno; then
     libc_type=msvcrt
-    add_cflags -Dstrtod=avpriv_strtod
-    add_cflags -Dsnprintf=avpriv_snprintf   \
-               -D_snprintf=avpriv_snprintf  \
-               -Dvsnprintf=avpriv_vsnprintf
+    add_compat strtod.o strtod=avpriv_strtod
+    add_compat msvcrt/snprintf.o snprintf=avpriv_snprintf   \
+                                 _snprintf=avpriv_snprintf  \
+                                 vsnprintf=avpriv_vsnprintf
 elif check_cpp_condition stddef.h "defined __KLIBC__"; then
     libc_type=klibc
 fi
@@ -2911,6 +2943,7 @@ test -n "$libc_type" && enable $libc_type
 # hacks for compiler/libc/os combinations
 
 if enabled_all tms470 glibc; then
+    CPPFLAGS="-I${source_path}/compat/tms470 ${CPPFLAGS}"
     add_cppflags -D__USER_LABEL_PREFIX__=
     add_cppflags -D__builtin_memset=memset
     add_cppflags -D__gnuc_va_list=va_list -D_VA_LIST_DEFINED
@@ -3071,9 +3104,7 @@ EOF
 
 elif enabled sparc; then
 
-    enabled vis &&
-        check_inline_asm vis '"pdist %f0, %f0, %f0"' -mcpu=ultrasparc &&
-            add_cflags -mcpu=ultrasparc -mtune=ultrasparc
+    enabled vis && check_inline_asm vis '"pdist %f0, %f0, %f0"'
 
 elif enabled x86; then
 
@@ -3162,6 +3193,7 @@ if enabled network; then
     check_struct "sys/types.h sys/socket.h" "struct sockaddr" sa_len
     check_type netinet/sctp.h "struct sctp_event_subscribe"
     check_func getaddrinfo $network_extralibs
+    check_func getservbyport $network_extralibs
     # Prefer arpa/inet.h over winsock2
     if check_header arpa/inet.h ; then
         check_func closesocket
@@ -3201,6 +3233,7 @@ check_func  localtime_r
 check_func  ${malloc_prefix}memalign            && enable memalign
 check_func  mkstemp
 check_func  mmap
+check_func  mprotect
 check_func  ${malloc_prefix}posix_memalign      && enable posix_memalign
 check_func_headers malloc.h _aligned_malloc     && enable aligned_malloc
 check_func  setrlimit
@@ -3277,22 +3310,13 @@ done
 check_lib math.h sin -lm && LIBM="-lm"
 enabled vaapi && require vaapi va/va.h vaInitialize -lva
 
-check_mathfunc cbrtf
-check_mathfunc exp2
-check_mathfunc exp2f
-check_mathfunc isinf
-check_mathfunc isnan
-check_mathfunc llrint
-check_mathfunc llrintf
-check_mathfunc log2
-check_mathfunc log2f
-check_mathfunc lrint
-check_mathfunc lrintf
-check_mathfunc rint
-check_mathfunc round
-check_mathfunc roundf
-check_mathfunc trunc
-check_mathfunc truncf
+atan2f_args=2
+ldexpf_args=2
+powf_args=2
+
+for func in $MATH_FUNCS; do
+    eval check_mathfunc $func \${${func}_args:-1}
+done
 
 # these are off by default, so fail if requested and not available
 enabled avisynth   && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32
@@ -3386,7 +3410,7 @@ enabled jack_indev && check_lib2 jack/jack.h jack_client_open -ljack &&
 enabled_any sndio_indev sndio_outdev && check_lib2 sndio.h sio_open -lsndio
 
 enabled libcdio &&
-    check_lib2 "cdio/cdda.h cdio/paranoia.h" cdio_cddap_open "-lcdio_paranoia -lcdio_cdda -lcdio"
+    check_lib2 "cdio/cdda.h cdio/paranoia.h" cdio_cddap_open -lcdio_paranoia -lcdio_cdda -lcdio
 
 enabled x11grab                                           &&
 require X11 X11/Xlib.h XOpenDisplay -lX11                 &&
@@ -3537,6 +3561,12 @@ elif enabled msvc; then
     enabled x86_32 && disable aligned_stack
 fi
 
+case $target_os in
+    plan9)
+        add_cppflags -Dmain=plan9_main
+    ;;
+esac
+
 enabled_any $THREADS_LIST      && enable threads
 
 enabled asm || { arch=c; disable $ARCH_LIST $ARCH_EXT_LIST; }
@@ -3545,7 +3575,6 @@ check_deps $CONFIG_LIST       \
            $CONFIG_EXTRA      \
            $HAVE_LIST         \
            $ALL_COMPONENTS    \
-           $ALL_TESTS         \
 
 ! enabled_any memalign posix_memalign aligned_malloc &&
     enabled_any $need_memalign && enable memalign_hack
@@ -3743,6 +3772,8 @@ CFLAGS-avplay=$sdl_cflags
 ZLIB=$($ldflags_filter -lz)
 LIB_INSTALL_EXTRA_CMD=$LIB_INSTALL_EXTRA_CMD
 EXTRALIBS=$extralibs
+COMPAT_OBJS=$compat_objs
+EXEOBJS=$exeobjs
 INSTALL=install
 LIBTARGET=${LIBTARGET}
 SLIBNAME=${SLIBNAME}
@@ -3761,7 +3792,7 @@ get_version(){
     lcname=$1
     name=$(toupper $lcname)
     file=$source_path/$lcname/version.h
-    eval $(grep "#define ${name}_VERSION_M" "$file" | awk '{ print $2"="$3 }')
+    eval $(awk "/#define ${name}_VERSION_M/ { print \$2 \"=\" \$3 }" "$file")
     eval ${name}_VERSION=\$${name}_VERSION_MAJOR.\$${name}_VERSION_MINOR.\$${name}_VERSION_MICRO
     eval echo "${lcname}_VERSION=\$${name}_VERSION" >> config.mak
     eval echo "${lcname}_VERSION_MAJOR=\$${name}_VERSION_MAJOR" >> config.mak
@@ -3803,12 +3834,6 @@ print_config CONFIG_ "$config_files" $CONFIG_LIST       \
                                      $CONFIG_EXTRA      \
                                      $ALL_COMPONENTS    \
 
-cat >>config.mak <<EOF
-LAVF_TESTS=$(print_enabled   -n _test $LAVF_TESTS)
-LAVFI_TESTS=$(print_enabled  -n _test $LAVFI_TESTS)
-SEEK_TESTS=$(print_enabled   -n _test $SEEK_TESTS)
-EOF
-
 echo "#endif /* LIBAV_CONFIG_H */" >> $TMPH
 
 # Do not overwrite an unchanged config.h to avoid superfluous rebuilds.