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| author | Thomas Schwinge <thomas@codesourcery.com> | 2013-01-25 12:33:19 +0100 |
|---|---|---|
| committer | Thomas Schwinge <thomas@codesourcery.com> | 2013-01-25 12:33:19 +0100 |
| commit | bb931195fe780bb63e3d57d0742abad1d2128424 (patch) | |
| tree | 73a226fc980de52167e537d27d3fd3e5fc261993 /configure.in | |
| parent | a0b1cd8869ffe7d0a602d31a3629c8690987be59 (diff) | |
configure: Default to CPP="$CC -E" unless overridden.
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 4cfa36db00..2c50d0940f 100644 --- a/configure.in +++ b/configure.in @@ -17,6 +17,23 @@ AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS], [m4_divert_text([DEFAULTS], [ac_includes_default='/* none */'])]) +# We require GCC, and by default use its preprocessor. Override AC_PROG_CPP +# here to work around the Autoconf issue discussed in +# <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>. +AC_DEFUN([AC_PROG_CPP], +[AC_REQUIRE([AC_PROG_CC])dnl +AC_ARG_VAR([CPP], [C preprocessor])dnl +_AC_ARG_VAR_CPPFLAGS()dnl +# On Suns, sometimes $CPP names a directory. +if test -n "$CPP" && test -d "$CPP"; then + CPP= +fi +if test -z "$CPP"; then + CPP="$CC -E" +fi +AC_SUBST(CPP)dnl +])# AC_PROG_CPP + dnl This is here so we can set $subdirs directly based on configure fragments. AC_CONFIG_SUBDIRS() |