From: Markus Armbruster <armbru@pond.sub.org>
Date: Mon, 28 Dec 2020 04:07:50 +0000 (+0100)
Subject: configure: Test GCC-specific compiler flags only when using GCC
X-Git-Tag: v4.4.1~55
X-Git-Url: http://git.pond.sub.org/?p=empserver;a=commitdiff_plain;h=ec4004b4d4054dbe06158e24db66c6fbbbb2f6eb

configure: Test GCC-specific compiler flags only when using GCC

Commit 23373d01d "configure: Test compiler flags" (v4.4.0) made
configure test whether compiler flags work, to let us use flags that
work only for some compilers.

Unfortunately, the Sun C compiler accepts invalid options with a
warning, breaking the test.  Observed on Solaris 10.

Fix by testing the compiler flags only when AC_PROG_CC detected GCC.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
---

diff --git a/configure.ac b/configure.ac
index 1885981a7..933bc1ee4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,6 +91,9 @@ MY_WITH_READLINE
 
 ### Checks for typedefs, structures, and compiler characteristics
 
+if test "$GCC"
+then
+
 # Enable useful warnings
 # Some of them are commented out because the code needs cleanup first
 # Clang needs to be tested with -Werror=unknown-warning-option
@@ -168,6 +171,8 @@ main(int argc, char *argv[])
 }
     ]])])
 
+fi # $GCC
+
 
 ### Checks for library functions