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| author | Anders F Björklund <anders.f.bjorklund@gmail.com> | 2018-09-16 20:35:40 +0200 |
|---|---|---|
| committer | Anders F Björklund <anders.f.bjorklund@gmail.com> | 2018-09-16 20:40:25 +0200 |
| commit | 46a9248fedd29299ae089da12ae1b4b0d67fc71a (patch) | |
| tree | 83261c8dafdae94dbe6595fe2e54ee8a9e492c16 | |
| parent | c46da15589b971981435e11be31f9f2ccae1bb77 (diff) | |
| download | ccache-46a9248fedd29299ae089da12ae1b4b0d67fc71a.tar.gz | |
Add configure support for detecting clang
Also note that both GCC and Clang are GNU
| -rw-r--r-- | configure.ac | 7 | ||||
| -rw-r--r-- | m4/clang.m4 | 19 |
2 files changed, 24 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index 9a65f85d..345a5617 100644 --- a/configure.ac +++ b/configure.ac @@ -23,8 +23,11 @@ AC_SUBST(test_suites) AC_SUBST(disable_man) m4_include(m4/feature_macros.m4) +m4_include(m4/clang.m4) dnl Checks for programs. +AC_PROG_CC +_AC_LANG_COMPILER_CLANG AC_PROG_CC_C99 if test "$ac_cv_prog_cc_c99" = no; then AC_MSG_ERROR(cannot find a C99-compatible compiler) @@ -41,8 +44,8 @@ fi # Prefer bash, needed for test.sh AC_PATH_TOOL(BASH, bash, "/bin/bash") -# If GCC, turn on warnings. -if test "x$GCC" = "xyes"; then +# If GCC (or clang), turn on warnings. +if test "$ac_compiler_gnu" = yes; then CFLAGS="$CFLAGS -Wall -W" else CFLAGS="$CFLAGS -O" diff --git a/m4/clang.m4 b/m4/clang.m4 new file mode 100644 index 00000000..11911ce2 --- /dev/null +++ b/m4/clang.m4 @@ -0,0 +1,19 @@ +# _AC_LANG_COMPILER_CLANG +# --------------------- +# Check whether the compiler for the current language is clang. +# Adapted from standard autoconf function: _AC_LANG_COMPILER_GNU +# +# Note: clang also identifies itself as a GNU compiler (gcc 4.2.1) +# for compatibility reasons, so that cannot be used to determine +m4_define([_AC_LANG_COMPILER_CLANG], +[AC_CACHE_CHECK([whether we are using the clang _AC_LANG compiler], + [ac_cv_[]_AC_LANG_ABBREV[]_compiler_clang], +[_AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[#ifndef __clang__ + choke me +#endif +]])], + [ac_compiler_clang=yes], + [ac_compiler_clang=no]) +ac_cv_[]_AC_LANG_ABBREV[]_compiler_clang=$ac_compiler_clang +])])# _AC_LANG_COMPILER_CLANG + |