Merge pull request #4498 from netfoundry/gcc11.fixes_2.16

Backport 2.16: build with gcc11
diff --git a/ChangeLog.d/ciphersuite-sha1-sha384-guard.txt b/ChangeLog.d/ciphersuite-sha1-sha384-guard.txt
new file mode 100644
index 0000000..d253f34
--- /dev/null
+++ b/ChangeLog.d/ciphersuite-sha1-sha384-guard.txt
@@ -0,0 +1,4 @@
+Bugfix
+   * The cipher suite TLS-RSA-WITH-CAMELLIA-256-GCM-SHA384 was not available
+     when SHA-1 was disabled and was offered when SHA-1 was enabled but SHA-384
+     was disabled. Fix the dependency. Fixes #4472.
diff --git a/ChangeLog.d/make-generate-tests-python.txt b/ChangeLog.d/make-generate-tests-python.txt
new file mode 100644
index 0000000..0feeff8
--- /dev/null
+++ b/ChangeLog.d/make-generate-tests-python.txt
@@ -0,0 +1,4 @@
+Changes
+   * When building the test suites with GNU make, invoke python3 or python, not
+     python2. The build still works with either Python 2.7 or 3.5+, but we
+     recommend using a version of Python that is supported upstream.
diff --git a/ChangeLog.d/posix-define.txt b/ChangeLog.d/posix-define.txt
new file mode 100644
index 0000000..98cf2d0
--- /dev/null
+++ b/ChangeLog.d/posix-define.txt
@@ -0,0 +1,6 @@
+Bugfix
+   * In library/net_sockets.c, _POSIX_C_SOURCE and _XOPEN_SOURCE are
+     defined to specific values.  If the code is used in a context
+     where these are already defined, this can result in a compilation
+     error.  Instead, assume that if they are defined, the values will
+     be adequate to build Mbed TLS.
diff --git a/include/mbedtls/padlock.h b/include/mbedtls/padlock.h
index d8246e2..0e4a6bb 100644
--- a/include/mbedtls/padlock.h
+++ b/include/mbedtls/padlock.h
@@ -98,7 +98,7 @@
  *
  * \param feature  The feature to detect
  *
- * \return         1 if CPU has support for the feature, 0 otherwise
+ * \return         non-zero if CPU has support for the feature, 0 otherwise
  */
 int mbedtls_padlock_has_support( int feature );
 
diff --git a/library/net_sockets.c b/library/net_sockets.c
index 671115f..3874783 100644
--- a/library/net_sockets.c
+++ b/library/net_sockets.c
@@ -47,11 +47,15 @@
 /* Enable definition of getaddrinfo() even when compiling with -std=c99. Must
  * be set before config.h, which pulls in glibc's features.h indirectly.
  * Harmless on other platforms. */
+#ifndef _POSIX_C_SOURCE
 #define _POSIX_C_SOURCE 200112L
+#endif
 
 #if defined(__NetBSD__)
+#ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE 600 /* sockaddr_storage */
 #endif
+#endif
 
 #if !defined(MBEDTLS_CONFIG_FILE)
 #include "mbedtls/config.h"
diff --git a/library/ssl_ciphersuites.c b/library/ssl_ciphersuites.c
index 090040e..01df17a 100644
--- a/library/ssl_ciphersuites.c
+++ b/library/ssl_ciphersuites.c
@@ -918,13 +918,13 @@
       0 },
 #endif /* MBEDTLS_SHA256_C */
 
-#if defined(MBEDTLS_SHA1_C)
+#if defined(MBEDTLS_SHA512_C)
     { MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384, "TLS-RSA-WITH-CAMELLIA-256-GCM-SHA384",
       MBEDTLS_CIPHER_CAMELLIA_256_GCM, MBEDTLS_MD_SHA384, MBEDTLS_KEY_EXCHANGE_RSA,
       MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
       MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
       0 },
-#endif /* MBEDTLS_SHA1_C */
+#endif /* MBEDTLS_SHA512_C */
 #endif /* MBEDTLS_GCM_C */
 #endif /* MBEDTLS_CAMELLIA_C */
 
diff --git a/tests/Makefile b/tests/Makefile
index 1555b55..29f2fa1 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -44,8 +44,7 @@
 DLEXT ?= so
 EXEXT=
 SHARED_SUFFIX=
-# python2 for POSIX since FreeBSD has only python2 as default.
-PYTHON ?= python2
+PYTHON ?= $(shell if type python3 >/dev/null 2>/dev/null; then echo python3; else echo python; fi)
 endif
 
 # Zlib shared library extensions:
@@ -63,7 +62,7 @@
 
 .SILENT:
 
-.PHONY: all check test clean
+.PHONY: all c_files check test clean
 
 all: $(BINARIES)
 
@@ -71,6 +70,7 @@
 	$(MAKE) -C ../library
 
 C_FILES := $(addsuffix .c,$(APPS))
+c_files: $(C_FILES)
 
 # Wildcard target for test code generation:
 # A .c file is generated for each .data file in the suites/ directory. Each .c
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 1e56c3e..1a4de44 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -691,6 +691,18 @@
     record_status tests/scripts/doxygen.sh
 }
 
+component_check_python2 () {
+    # Check that what used to work with Python 2 still works with Python 2.
+    msg "check: python2 compatibility"
+    mkdir -p tests/with_python2 tests/with_python3
+    make -C tests PYTHON=python2 c_files
+    mv tests/test_suite_*.c tests/with_python2/
+    make -C tests PYTHON=python3 c_files
+    mv tests/test_suite_*.c tests/with_python3/
+    diff -r tests/with_python2 tests/with_python3
+    rm -rf tests/with_python2 tests/with_python3
+}
+
 
 
 ################################################################
diff --git a/tests/scripts/generate_test_code.py b/tests/scripts/generate_test_code.py
index f452b37..b74ed55 100755
--- a/tests/scripts/generate_test_code.py
+++ b/tests/scripts/generate_test_code.py
@@ -1,4 +1,7 @@
 #!/usr/bin/env python3
+
+# This script should still be compatible with Python 2 in Mbed TLS 2.16.x.
+
 # Test suites code generator.
 #
 # Copyright The Mbed TLS Contributors