From 06c87ae25bafabe9532df613c3d89ae659482b24 Mon Sep 17 00:00:00 2001
From: Anthony Cornehl <accornehl@fastmail.fm>
Date: Thu, 31 Aug 2017 13:16:00 -0700
Subject: [PATCH] Detect FreeBSD

FreeBSD requires __BSD_VISIBLE to be set to expose M_PI and mkstemp() in the
system includes. This is normally set when _ANSI_SOURCE, _C99_SOURCE, or
_C11_SOURCE are undefined. I don't want to dig into what the compiler is
setting, so I'm just setting it in the configure script.

/bin/sh ./libtool  --tag=CC   --mode=compile cc -DHAVE_CONFIG_H -I.    -fPIC -fvisibility=hidden -pedantic -fno-exceptions -D PATH_ESPEAK_DATA=\"/usr/local/share/espeak-ng-data\" -DLIBESPEAK_NG_EXPORT  -Isrc/include -Isrc/include/compat -I src/ucd-tools/src/include -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200112L -Wno-endif-labels    -g -O2 -std=c99 -MT src/libespeak-ng/src_libespeak_ng_la-wavegen.lo -MD -MP -MF src/libespeak-ng/.deps/src_libespeak_ng_la-wavegen.Tpo -c -o src/libespeak-ng/src_libespeak_ng_la-wavegen.lo `test -f 'src/libespeak-ng/wavegen.c' || echo './'`src/libespeak-ng/wavegen.c
libtool: compile:  cc -DHAVE_CONFIG_H -I. -fPIC -fvisibility=hidden -pedantic -fno-exceptions -D PATH_ESPEAK_DATA=\"/usr/local/share/espeak-ng-data\" -DLIBESPEAK_NG_EXPORT -Isrc/include -Isrc/include/compat -I src/ucd-tools/src/include -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200112L -Wno-endif-labels -g -O2 -std=c99 -MT src/libespeak-ng/src_libespeak_ng_la-wavegen.lo -MD -MP -MF src/libespeak-ng/.deps/src_libespeak_ng_la-wavegen.Tpo -c src/libespeak-ng/wavegen.c  -fPIC -DPIC -o src/libespeak-ng/.libs/src_libespeak_ng_la-wavegen.o
src/libespeak-ng/wavegen.c:355:24: error: use of undeclared identifier 'M_PI'
                        x = 127*(1.0 - cos((M_PI*2)*ix/wavemult_max));
                                            ^
src/libespeak-ng/wavegen.c:623:16: error: use of undeclared identifier 'M_PI'
        minus_pi_t = -M_PI / samplerate;
                      ^
2 errors generated.
gmake[1]: *** [Makefile:1690: src/libespeak-ng/src_libespeak_ng_la-wavegen.lo] Error 1
---
 configure.ac | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/configure.ac b/configure.ac
index 2d28da70..82a83a07 100644
--- a/configure.ac
+++ b/configure.ac
@@ -83,6 +83,23 @@ else
 	AC_MSG_ERROR([C99 is not supported by $CC.])
 fi
 
+dnl ================================================================
+dnl FreeBSD check.
+dnl ================================================================
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+		   #if ! defined(__FreeBSD__)
+		   #error macro not defined
+		   #endif
+		   ]])], [FREEBSD_FOUND="yes"], [FREEBSD_FOUND="no"])
+
+AC_MSG_CHECKING([if targeting FreeBSD])
+if test "$FREEBSD_FOUND" = "yes" ; then
+	AC_MSG_RESULT([-D__BSD_VISIBLE])
+	CFLAGS="$CFLAGS -D__BSD_VISIBLE"
+else
+	AC_MSG_RESULT([no])
+fi
+
 dnl ================================================================
 dnl library checks.
 dnl ================================================================